One Height Over Another

Geometry Level 3

Two identical, orange equilateral triangles are each positioned in a large, black triangle such that

  • in the left diagram, the corresponding sides of the two triangles are parallel to each other;
  • in the right diagram, the orange triangle fits in the top corner of the black triangle.

Then, we find that three trapezoids with respective heights h 1 , h 2 , h 3 h_1, h_2, h_3 can be formed in each black triangle, as shown.


True or False?

The two black triangles have equal areas.

True False It depends on the condition.

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1 solution

Marta Reece
Aug 9, 2017

After adding a height to one side of the original equilateral triangle, a new equilateral triangle is formed.

It does not matter which side of that triangle the next height is added to. The resulting triangle is the same.

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